Webagg blit fix

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 5.88235% with 32 lines in your changes are missing coverage. Please review.

Project coverage is 75.03%. Comparing base (7eef546) to head (fc9bc07).

Files	Patch %	Lines
eomaps/eomaps.py	5.88%	32 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #225 +/- ## ========================================== - Coverage 75.23% 75.03% -0.21% ========================================== Files 26 26 Lines 11709 11743 +34 ========================================== + Hits 8809 8811 +2 - Misses 2900 2932 +32 ```

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